Additional
Information: This category is for sites for chatrooms and online discussion forums that are dedicated to physics in general.
Note that discussions dedicated to specific topics in Physics should go under the topical category in question.
Scott Watson's Physics FAQs Scott Watson's Physics FAQs: A list of FAQs (Frequently Asked Questions) regarding Cosmology, String theory, Relativity and General Physics (Chats and Forums) http://www.het.brown.edu/people/watson/pages/resources.htm
Physics and Astronomy Forums Physics and Astronomy Forums: A series of different threaded forums for discussing famous people as well as topics related to astronomy and astrophysics. (Chats and Forums) http://astronomyphysics.com/
Groupsrv.com - Physics Forum Groupsrv.com - Physics Forum: Discussion for scientists. (Chats and Forums) http://www.groupsrv.com/science/viewforum.php?f=1
Physics Forums Physics Forums: Bulletin boards on physics and related subjects. Includes related polls and a list of active threads. (Chats and Forums) http://www.physicsforums.com/
Advanced Physics Forums Advanced Physics Forums: Intended primarily for physics majors, graduate students, postdocs and faculty. Get meeting information, theoretical and research information and exchange of ideas. Meant for the physics community throughout the world. (Chats and Forums) http://www.advancedphysics.org/
Theoretical Physics Theoretical Physics: Archives of an discussion group for discussing related topics. (Chats and Forums) http://research.spinweb.com/
Physics & Astronomy Discussion Forums Physics & Astronomy Discussion Forums: Discussion forums devoted to physics & astronomy, with a concentration on eletricity and magnetism. (Chats and Forums) http://physicsastronomy.com/
Additional
Information: This category is for sites for chatrooms and online discussion forums that are dedicated to physics in general.
Note that discussions dedicated to specific topics in Physics should go under the topical category in question. 
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